Why does my monitor go black when lights turn on?
Turning on light switches, opening doors, or running nearby appliances like a clothes dryer causes computer screens to briefly go black for a few seconds. This sudden blanking leaves users confused and unable to figure out whether the issue stems from faulty cords or an electrical problem.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1plugging the monitor into a different outlet on a separate circuit
- 2getting a cheap line-interactive UPS
- 3Looking into surge protectors, AVR units, or uninterruptible power supplies (UPS)
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
r/HomeMaintenance1 person · September 2026
r/askanelectrician1 person · September 2026
“My clothes dryer, which is in the room next to the living room where my gaming PC is, is suddenly making my monitor screen go black for about 2-3 seconds and then it comes back on.”source ↗
RGR_Gaming10X · r/askanelectrician